chemical purification

基本解释

Nuclear pure natural flake graphite has been obtained by chemical purification process.
用化学提纯工艺制出了核纯天然石墨粉；
Answer: want first choice, remaking sand, through the magnetic separation, flotation or chemical purification, silica be 95 percent.
答：先要精选，再制砂后，经磁选、浮选或化学提纯后，二氧化硅能达到95%。
The investment and purification cost of chemical purification method is considered lower in producing feed grade, industrial grade, food grade phosphate by using WPA;
认为，用湿法磷酸制饲料级、工业级和食品级磷酸盐产品，采用新化学净化湿法磷酸投资少，净化成本低；